Minn. Stat. § 257.54: HOW PARENT AND CHILD RELATIONSHIP ESTABLISHED.

The parent and child relationship between a child and:

(a) the biological mother may be established by proof of her having given birth to the child, or under sections 257.51 to 257.74 or 257.75;

(b) the biological father may be established under sections 257.51 to 257.74 or 257.75; or

(c) an adoptive parent may be established by proof of adoption.